[Hunt!!] Go and hunt some Unicorn Horn to earn more RS gold
Hunting down some Black Unicorns is a great and simple way to make more RS gold.

Source: RuneHQ
The Making of RS gold from gathering Unicorn horns
The Black unicorns are a bit dangerous than your regular unicorns that you found on various location in Runescape. They can be aggressive to all players in the Wilderness but not considered a threat when it comes from high leveled players since black unicorns are low leveled. The items that are worth of RS gold from Black Uniforms are the Unicorn horn.
The reason why the Unicorn horn is worth of Rs gold it’s because they can use it to make various potions by turning it to Unicorn horn dust such as: anti-poison super anti-poison and Sanfew Serum. The unicorn horn is also use for Unicorn stallion pouches. They are highly demand from herbalist and summoner.
Guide to earn more RS gold
It is preferably farm Black Unicorn in the level 10 to 17 Wilderness. The black unicorns can be found at the southwest of Wilderness Volcano. Since the black unicorns have a fast spawn rate, you can collect unicorn horn much faster. Once your inventory is full of unicorn horns, go back to the city and sell the entire unicorn horn at the Grand Exchange for Rs gold. Repeat the process until you’re satisfied with the results.